diff --git a/package.json b/package.json
index 4f9efb2..f0e5256 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "langtail",
-  "version": "0.13.2",
+  "version": "0.13.3",
   "description": "",
   "main": "./Langtail.js",
   "packageManager": "pnpm@8.15.6",
diff --git a/src/getOpenAIBody.ts b/src/getOpenAIBody.ts
index af8155c..ffe7010 100644
--- a/src/getOpenAIBody.ts
+++ b/src/getOpenAIBody.ts
@@ -68,7 +68,7 @@ export function getOpenAIBody(
 
   if (parsedBody.max_tokens || completionArgs.max_tokens) {
     openAIbody.max_tokens = parsedBody.max_tokens ?? completionArgs.max_tokens
-    if (parsedBody.max_tokens === -1) {
+    if (openAIbody.max_tokens === -1) {
       delete openAIbody.max_tokens
     }
   }